In this topic I won't focus that much on differences between SMM2 and SMBX's seesaw. I will rather focus on explaining how the seesaw works in SMM2.

1.) HitboxesIf something is stood on the blue zone, the platform won't bow:

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This is true for all sizes.If any part of the NPC/player is stand out of the blue zone, the platform will start bowing.

2.) WeightIn SMM2, any object (even a single coin) stand out of the "blue zone" will make the platform bows until it reaches its maximum degree:

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In SMBX however, this doesn't happen.

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It is ok that in SMBX the platform bows slower if the npc is near to the midpoint, what should be fixed is that it shoudln't stop bowing it there.

3.) Leaving the platformWhen the platform was inclinated and object that was on top of it is no longer there, it will try to recover to its original state slowly:

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4.) Things that only happens in SMBXa. The platform is to "bouncy" in SMBX 1.4.5. In SMM2, the only time when the platform really bounces is when it reaches it's maximum angle with certain speed.

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b. In SMM2 you can't slide on the platform:

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I suggest removing the ability of sliding in the platform in smbx as well. Sometimes, some jumps feels odd when you just want to duck and jump, because the player starts sliding. Probably it is worth leaving a flag to enable or disable the ability to slide, but if you do so, please leave it disabled by default.

c. I suggest limiting the size of the platform to 300% (15 blocks in total). Why? because in SMM2 this is the biggest you can make the platform too, and I noticed that if you make this platform bigger, it starts feeling much less smoother and becomes more buggy when bows. I also don't think anyone really needs a 20-block length platform.

d. NPCs that are stacked on top of others won't accumulate weight:

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This is not as important as the other points, but it should be fixed.

e. The platform still pushes out the player in the edges (much less than before, but it's still a problem):

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(Here I pressed "right" key but for some reason it pushed me back when I started to move)

I didn't press anything here:

f. You should be able to stop keep the platform at certain angle by doing this (it's also a good way to check if physics are right):